...and that would be a reason for the testing of all visitors by some method. If you can reasonably say that everyone that arrives is negative then it shouldn't be an issue for the countries involved.

With that said I wouldn't want to go to SXM untested and rely on being negative when I am in the SXM airport....it WOULD hit the fan if you came back asymptomatically positive, had to quarantine for 14 days or so and couldn't fly back until you were negative